Every bigot’s handbook. Migration levels to the UK are less than 1% per year and the public perception of immigration is exacerbated by the Mail and Express dripping a constant anti-immigrant bias. The UK has actively needed immigration and encouraged it during the Windrush. If you look at the economic performance of countries with lower net migration and aging populations like Japan and Italy they are far below that of the UK. Which would you rather have 1 million people who are young, healthy, will not use your social or health services and who are economically active or 1 million people who are retired claiming pensions and using healthcare frequently? You can only pay for one (the retirees) if you have the other in excess (the workers).
It is a fair comment to say that migration takes skilled people away from developing countries, but the way to deal with that is not limits on immigration but developing them faster. Why do you want to come to a miserable dank dark country when you could be living in the sunny Caribbean where most British dream of spending a few weeks of the year? The British seem to be deluded by some idea that coming here is a great thing because it is such an amazing life. Sorry to disappoint but people come here because of necessity and not choice. If we change the necessity then they will not make the choice, but until then we need to welcome them openly because they give more than they take.